Lithographer&#39;s press



Oct. 31, 1939. s F KJELL- 2,178,259

LITHOGRAPHERS PRESS Filed June 22, 1938 Iig. Z. T

3 Sheets-Sheet 2 Oct. 31, iig-359.

s. F. KJELL LITHOGRAPHERS PRESS Filed June 22, 1938 3 Sheets-Sheet 5 Agg i Snnnfjgell,

Patented Oct. 31, 1939 UNITED STATES PATENT OFFICE 16 Claims.

This invention relates to presses and particularlyr to presses for use by lithographers and engravers, the object of the invention being the production of a machine of this character which v will be inexpensive to construct, and will operate more expeditiously. v

'I'his ob-ject is attained by the mechanism illustrated in the accompanying drawings.

For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is v to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and the invention is not limited to the precise arrangement and organization ofthese instrumentalities as herein shown and described except as required by the scope of the appended claims.

kOf the drawings:

Figure l represents a vertical section of a machine embodying the principles of the present invention.

Figure 2 represents a plan of the same with the offset device and tympan support in operative position. n v

Figure 3 represents an end elevation of the same. f Y

Figure 4 represents an enlarged longitudinal section of the sameon line 4, 5, on Fig. 2.

Figure 5 represents a transverse section of the offset device.

Figure 6 represents a sectional detail of the scraper coacting with tympan.

Figure 7 represents a plan of a portion of the press bed.

f Figure 8 represents a sectional detail of one of the slotted supports for the bar carrying thev scraper frame.

Figures 9 and 10 represent sectional details` to be hereinafter described, and

Figure 1l represents an elevation of a roller mechanism which may be substituted for the scraper ordinarily used.

Similar characters indicate like parts throughout the several gures of the drawings.

In the drawings, IIJ is a framework upon which is mounted a thick wooden top I I.

Superimposed upon this top II is a press bed consisting of a wooden framework I2 upon which is positioned an iron casting I3, to the upper face of which `is secured a steel plate I4 beneath which is a thin sheet of rubber Ma: to assure even pressure -when a print is being made from a litho- (Cl. 10i-130) graphic or engraved steel plate imposed on the D i top of said steel plate. l

The plate I4 is secured to the iron casting I3 by means of countersunk screws I5.

When a zinc plate is used on top of plate I@ it is secured to said plate I4 by countersunk screws I5 at the right hand end of the press bed, as shown in Fig. 9 of the drawings.`

To one end of the wooden top II are secured two brackets I6 having pivoted thereto, at I'I, a framework i8 within which is pivotally mounted an offset device I9.

'Ihe pivotal connections 20 between this oiset device I9 and the framework, I8 are midway between the ends of said oiset device I8 to permit the reversal of said device I9 when desired.

The wooden framework I2 and the iron casting I3 superimposed thereon are surrounded by an iron frame 2l having ears 22 extending therefrom in which are mounted a plurality of bolts 23, the upper projecting ends of which are adapted to enter ythe depressions 2li` in the frame 25 of the oset device I9 to register the frame 25 when in its Alowered horizontal position.

The opposite sides of the frame 2.5 has adjustably secured thereto a` pair of gripper members 26, eachhaving at one end thereof aresilient disk 2l on the under side thereof which is adapted to grip a sheet of paper placed upon said device I9.

When the oiset device I9 is in horizontal position'the members 27 on the under side of frame r will extend into depressions 28 in the edge of the plate I4.

The members 26 may be adjusted towards and from each other by changing the clamp screws 26a: to other threaded holes 24x, thus providing means for clamping various sizes of paper sheets. The frame I3 includes a rounded rod 29 which may be gripped by the operator to move the frame I8 about its pivot Il from its raised position as shown in Fig. f1, into the position indicated in Figs. 2, Band 4, or vice versa.

The wooden top II has'secured to the opposite sides thereofftwo supports 30 having upward extensions 3| provided with open ended slots 32 in their upper ends.

In these slots 32 are positioned movable bearings 33 in which are mounted the opposite cylindrical ends of a bar 34, through which extends an adjusting screw 35 threaded to a bracket 36 secured to said top II, as shown inFig. l.

This adjusting screw 35 is provided with a milled head 3l by which it may Vbe turned in order to make the required adjustment of the bar 34 in the slots 32.

To the bar 34 are secured the side rails 38 of a framework connected together at the opposite ends thereof by U-shaped members 39, 49.

These side rails 38 are provided with bearings for the shafts 4| and 42, each of which is provided with a pair of sprocket wheels 43 on which are mounted two parallel sprocket chains 44, the opposite ends of which are connected to angle irons 44.1: on opposite sides of a movable scraper 45, as shown in Fig, 4 of the drawings.

The shaft 42 has a handle 46 by which it may be rotated manually to move the scraper 45 in either direction.

In larger machines the handle 46 may be dispensed with and power mechanism connected to said shaft.

Depending from the side rails 38 is a U-shaped member 41 having secured to the lower end thereof one end of a metal tympan sheet 49, the opposite end of which is secured to another U-shaped member 5D pivoted to side rails 38 at 5| and pressed outwardly by means of a spring 52 to keep the metal tympan sheet tautat all times.

Secured to one end of the side rails 38 is a counterbalance weight 53 adapted to retain the framework38, 39, 40, under normal conditions, in the raised position as shown in Fig. 1.

To the U-shaped member 39 is secured a nut 54 in which is mounted the screw 55 having a milled head 56 at the upper end thereof and an annular flange or button 51 at its lower end.

When the framework 38, 39 and 48 is in its horizontal position as indicated in Fig. 4, this annular flange or button 51 is adapted to engage with the slotted hook member 58 on the upper end of a pressure rod 59 which is pivoted at 69 to a member 6I slidable vertically in the bearings 63, 64, mounted upon a plate 65 secured to a girt 66 of the frame Ill.

Pivoted to this plate 65 at B1 is a lever 68 having secured thereto a plate B9 having a pin 10 extending into a slot 1| formed in an ear 12 projecting from the slidable member 6I.

When the lever 68 is moved about its pivot to the right of the position indicated in Fig. 3, the member 6| will be moved downwardly thereby drawing down the adjustable member 55 at the free end of the framework 38, 39 and 40.

The slidable member 6| has secured thereto an upwardly extending spring 13 bearing againstthe pressure rod 59 and thereby retaining it in position against the block 14 secured to a vertical plate 15 beneath the wooden top I of the framework I0.

The block 14 is provided with an inclined face 14m at its lower end adapted to coact with a block 59a: on the rear of the pressure rod 59 when the slidable member 6| is raised in order to move said rod 59 outwardly to release the button 51 from the hook member 58.

rlhe offset device I9 held within the frame 25 consists of an aluminum sheet 16 on the opposite sides of which are rubber blankets 11.

The rubber blankets are made nonstretchable by gluing theback of the rubber blanket to a suitable cardboard, as for instance, Bristol board.

This is done by making a smooth coating of glue on the back of the rubber blanket and then passing a special heavy pressure roller over the cardboard and thereby pressing it gradually to the back of the rubber blanket.

The scraper member 45 has secured to its opposite ends flanged plates 18 bearing against the side rails 38 and has a cross plate 19 secured to the upper end thereof, the ends ofl said plate 19 extending over said side rails 38, thus forming with the plates 18 a good guide for the member 45 as it is moved longitudinally of the side rails 38.

The scraper member 45 has openings 89 therein through which the sprocket chains 44 extend.

On the top of the steel plate I4 is placed an original printing plate with printing characters formed on the upper face thereof and when this original plate is inked and the offset member I9 is moved downwardly thereon, one of the rubber blankets 11:1: will contact therewith, the other rubber blanket 11 being on top.

The original printing plates may be made of steel, aluminum or zinc, as desired, according to the work to be done.

When the framework 38, 39 and 40 is moved down into horizontal position above the offset device |9 and the scraper 45 is moved along the tympan sheet an impression from the steel or zinc plate will be made upon the lower rubber blanket 11x.

If the offset device I9 is then raised into position shown in Fig. 1, turned about its pivots 20 and is again lowered into horizontal position, the rubber blanket 11x which has just taken an impression will be on top and a clean rubber blanket 1.1 will be in contact with the steel or zinc plate.

A sheet of paper 8| is then secured in position by means of the gripper members 21 and the framework 38, 39 and 40 is then moved into horizontal position, as shown in Fig. 4, and locked in this position by button 51 and hook 58.

The sheet of paper 8| will be held by means of the gripper members 21, so that it 'cannot be displaced as the scraper 45 passes over the surface of the tympan sheet.

During this movement of the scraper member 45 a new impression will be made on the under rubber blanket 11 and the impression previously made on the upper rubber blanket 11m will be transferred to the under face of the sheet of paper 8|.

It is obvious that this operation may be repeated indefinitely and every time the scraper 45 moves along the tympan sheet one impression will be made from the steel or zinc plate on the under rubber blanket while an impression from the upper rubber blanket is simultaneously being transferred to the paper sheet 8| superimposed thereon.

By this means much more work will be accomplished than is ordinarily accomplished on machines of this character.

It is self-evident that the proper pressure may always be obtained by adjusting the screws 35 and 55.

When the head 51 is released from the slotted hook member 58 the counter-balance weight 53 will make it easy for the operator to return the framework 38, 39 and 40 to its vertical position, as shown in Fig. 1, or these weights may be sufficient to return the framework 38, 39 and 4D to its vertical position as soon as the button 51 has been released from the hook 58.

Instead of a scraper 45, a roller 45a: may be used, a roller being preferable for certain kinds of work, as for instance, in making line etchings.

One form of roller mechanism is shown in Fig. 11 in which the frame 38 has secured thereto forked brackets 82 straddling the shaft 83 of a roller 453:, the opposite ends of said shaft having secured thereto Wheels 84 with the peripheries :parallelism with saidrprintingmember; two endof which revoluble pressure Wheels 85 coactto'apply pressure to the roller x.

The 'member 86-r is provided: to' preventthe accidental displacement of'. the shaft 83 from "the forked lowerendslof members-82. v A i y 'Ihesteelplate may beimade.rectangularasiindic'ated:V in Fig'. 10 `atzl4| 'and' aprinting. plate `placed directly onlthev iron casting vI3 with. the

printing plate .P abutting .an rinner wall ofr the rectangular steel plate MI.

-Theplates MI do not require screws to 'retain them `in position'as they maybe secured in -position byhaving their lower 'sides inked and then yfirmly pressedagainst thefupper'face'of the cast iron plate"l3 c f v It is believed that the operation andmany vadvantages of the invention will-be `understood without further description) f f Having thus 'described'my invention, I claim: -1. The combination of a'horizontal table, a bed supportedthereon; a printing plate secured to -said bed; an oiset `device hinged to one side of said table and movable into position parallel with said plate, lsaid "offset device having vresilient "blankets on opposite sidesthereof ;v means .on said :device for clamping a paper sheet thereto; pres- -sure mechanism movable inA a direction at right angles tothe movement'of the hinged'oiset device intok parallelismwith said printing plate and into contact with said offset device ;lv and means for regulating the pressure of said mechanism. 2. The combination of a horizontaltable, a bed supported thereon; a printing 'plate secured to said bed; a framework hinged tov one side of said table and movable into positionparallel withsaid plate;r an oifsetdevic'e pivoted to and reversible in said framework, said offset device having resilient blankets on-ppo'sitefsides thereof; means on said device for elampingfa papersheet thereto; pressure mechanism movable`v in a' direction at right angles `to the movement of vthe hinged off- ;v set device into parallelism` with "said printing 'plate "and into contact withvsaid offset device;V and means for regulating the pressure of said mechanism. v u v l y K 3. The combinationofa horizontal table, aire-I movable bed' supported thereon?y twoymetal plates secured toV said bed'with an interposed rubber sheet, the upper 'platebeing ia printing plate; a yreversible offset device hinged to Vag side of `said table adapted to be moved into contact with the printing plate and consisting of a metal plate having resilient blankets on opposite sides thereof; means for clamping apaper sheet to the upper blanket; vand means for applying pressure'to said offset device when in horizontal position.

Il; The combination of v a horizontal table, a removable bed supported thereon; a printing plate secured to said bed; a `reversible offset device v hinged to a side of said table and adapted to be vmoved into contact with said printing plate,` said device consisting of a metal plate having resilient` l blankets on 'opposite sides'thereof; means for n clamping a paper sheet to the upper blanket; and

means for applying pressure to said offset device including a metal tympan and a scraper movable in Contact therewith in a path parallel with the face of said printingiplate.

5, The combination of a horizontal table, a printing member supported thereon; a reversible oifset device hinged to a side of said table and adapted to be superimposed on said printing member; means for clampingapaper sheet to said device; a framework hinged to said table at right angles to said offset device and movable into less chains supported 'by said framework; a

:scraper secured tosaidchains; a metal tympan carriedby said framework and extending beneath .and in contactwith said scraper; and means-for .actuating said chains to move said scraper'longi- Ittudinally ofl said framework.

.6. AThe combination of av horizontal table, a printing member supported thereon; a reversible offset device hinged to a side of said table and adapted tobe superimposed on said printing member; means for clamping a paper sheetto said deviceya framework hingedto said table at rightangles to said offsetdevice and movable into parallelism with said printing member; two endless chains supported by said framework; a scraper securedto said chains; a metal-tympan carried by said framework and extending beneath vand in Contact with said scraper; means for moving/said frameworkV toward and from said printing member; and means for actuating said chains to move said scraperlongitudinally of said frameand in contact with said scraper; means for locking the free 'end of said Aframework to said table;

scraper longitudinally or"r` said framework.

8. The combination of a horizontal table, a printing member'supported thereon; a reversible Voffsetydevice hinged to a side of said table and adapted to be superimposed on said printing member; 'means forvclamping aV paper sheet to said device; a framework hinged to said table at right angles to said' offset device and movable into parallelism withsaid printing member; two endless` chains v4supp'rrted by said framework; `a scraper securedjto said chains; a metal tympan carried by said framework and extending beneath and in contact with said scraper; means for lockling the free' end ofsaid framework tosaid table; means for actuating said chains to move said scraper longitudinally of said framework; and a weight for raising said framework to a vertical position when unlocked from said table.

9. The combination of a horizontal table; a bed supported thereon; a printing plate on said bed; a

reversible offset device hinged to a side of said table and movable into position parallel with said plate, said offset device consisting of a flat metal plate having resilient blankets clamped to the opposite sides thereof; means on said offset device for clamping a paper sheet thereto; pressure mechanism hinged to said table at right angles to said offset device and movable into parallelism with saidprintingplate and into contact` with said offset device; and means for locking the free end of said pressure mechanism to said table.` f f 10. The combination of a horizontal table, a bed supported thereon; a printing plate on said bed; a rframework hinged to a side of said table and movable intov position parallel with said plate; an offset device pivoted to and reversible in said framework, said offset device having resilient and means for actuating saidchains to move said blankets on oppositesides thereof; means on said device for clamping a paper sheet thereto; pressure mechanism hinged to said table at right angle to said framework and movable into parallelism with said printing plate and into contact with said offset device; means for locking said pressure mechanism'to the table; and means for moving said pressure mechanism upwardly into vertical position when released from said locking means.

11. The combination of a horizontal table, a bed supported thereon; a printing plate on said bed; a reversible offset device normally in vertical position and adapted to be moved into contact with the upper face of said printing plate and consisting of a metal plate having resilient blankets clamped to the Vopposite sides thereof; means for clamping a paper sheet to the upper blanket; and means movable transversely of and into contact with said offset device for applying downward pressure to said offset device.

12. The combination of `a horizontal table, a bed supported thereon; a printing plate secured to said bed; a frame hinged to one side of said table and normally vertical; an offset device reversibly mounted in said frame and adapted to be moved with said frame into contact with said printing plate; means for` clamping a paper sheet to one face of said offset device; a framework hinged to said table and movable at right angle to the movement of said frame into horizontal position above said offset device; and means carried by said framework for applying pressure to said offset device, said means including a metal tympan in contact with said paper sheet and a scraper movable in a straight path. `over the upper face of said tympan.

13. The combination of a horizontal table, a printing member supported thereon; a reversible offset device adapted to be superimposed on said printing member; means for clamping a paper sheet to said device; a framework hinged toa side of said table and movable into parallelism with said printing member; two endless chains supported by said framework; a scraper selcured to said chains; a metal tympan carried by said framework and Aextending beneath and in contact with said scraper; means for actuating said chains to move said scraper longitudinally of said framework; means for locking the free end of said framework to a member slidable vertically on said table; and a lever-actuated `mechanismfor' `releasing said. framework from said locking means." i l 414.?The combination of a horizontal table, a

4printing member supported thereon; a reversible offset device adapted to be superimposed on said printing member; means for clamping a. paper sheet to said device; a framework hinged to a side ofzsaidtable and movable into parallelism rwith said yprinting member; two endless chains supported by said framework; a scraper secured tosaid chains; a metal tympan carried by said framework'andextending beneath and in contact with said scraper; means for moving said 'frameworktoward and from said printing member; and means for actuating said chains to move said scraper in either direction longitudinally of said framework.

15. The combination of a horizontal table; a printing member supported thereon; a reversible offset device adapted to'be superimposed on said printing member; means for clamping a paper sheet to said device; a framework hinged to a side of said table and movable into parallelism with said printing member; two endless chains supported by said framework; a scraper secured to and depending from said chains; a metal tympan carried by said framework and extending beneath and in contact with said scraper; a threaded shouldered member adjustable in the free end of said framework; a member slidable vertically on said table; a spring-pressed hook pivoted to said slidable member and engaging said shouldered member; a 1ever-actuated mechanism for releasing said hook from said shouldered member; and means for actuating said chains to move said scraper in either direction longitudinally of said framework.

16. 'I'he combination of a horizontally disposed printing member, a hinged device adapted to be moved into contact therewith consisting of a flat metal plate having rubber blankets on the opposite sides thereof; means for securing a paper sheet to the upper blanket; and mechanism contacting with the paper sheet for applying downward pressure to said sheet and device when in horizontal position whereby a printing is made from said plate on the face of the lower blanket and a transfer or offset is simultaneously made on the paper sheet from aprinting previously made on the upper blanket.

SIMON F. KJEIL. 

